From owner-freebsd-bugs@freebsd.org Fri Mar 29 23:04:21 2019 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B48101556235 for ; Fri, 29 Mar 2019 23:04:21 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 3179986BD7 for ; Fri, 29 Mar 2019 23:04:21 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id E458F1556230; Fri, 29 Mar 2019 23:04:20 +0000 (UTC) Delivered-To: bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D18F6155622F for ; Fri, 29 Mar 2019 23:04:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 6AB2E86BD5 for ; Fri, 29 Mar 2019 23:04:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id A700214CB2 for ; Fri, 29 Mar 2019 23:04:19 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id x2TN4J7K079139 for ; Fri, 29 Mar 2019 23:04:19 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id x2TN4JM4079138 for bugs@FreeBSD.org; Fri, 29 Mar 2019 23:04:19 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 236888] ppp daemon limits mtu to 1492 for PPPoE Date: Fri, 29 Mar 2019 23:04:19 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: 11.2-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: freebsd.68fba@nospam.spacesurfer.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Mar 2019 23:04:22 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D236888 Bug ID: 236888 Summary: ppp daemon limits mtu to 1492 for PPPoE Product: Base System Version: 11.2-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: freebsd.68fba@nospam.spacesurfer.com The ppp daemon in FreeBSD 11.2 limits the maximum MTU to 1492 for the ppp/t= un device. Changing the MTU and MRU in the ppp.conf file to values above 1492 doesn't work. This is because the limit is hard coded in /usr/src/usr.sbin/ppp/ether.c My ADSL modem (vigor 130) supports an MTU above 1500 and if I change the li= mit in ether.c to 1500, set my ethernet mtu to 1508 or more, then ppp will negotiate a higher MTU/MRU for the link and it will work fine (I tried 1500 byte ping probes with the DF flag set and it works) Unfortunately, you can't just change the ether.c value because it uses the limit as the default and so my old modem (can only do 1492 or less) will not work unless I set the MTU to 1492 in the ppp.conf file. It would probably be best to leave the default at 1492 since this is the most common maximum MTU= for ADSL modems, but allow it to be overridden to whatever you want in the conf= ig file. --=20 You are receiving this mail because: You are the assignee for the bug.=